Planograril co



G. F. NAAB AND H. PRELL,

BLOWPIPE.

APPLlCATlON- FILED APR. 27, 1917.

Patented Sept. 30, 1919.

2 SHEETSSflEET l.

fizz/22222713- G. F. NAAB AND H. PRELL.

BLOWFIPE.

APPLICATION FILED APR. 21, 1911.

l ,3 1 7, 638. Patented Sept. 30, 1919.

2 SHEETS-SHEET 2 I IA PLANOGRAPH co, WASHINGTON, D. c.

GEORGE F. NAAIB, or LAKEWOOD, AND HENRY Fan a, or EAST CLEVELAND, OI-IIQ,

ASSIGNORS TO THE NAAB MANUEACTUEINGCQMPAN Y, OF CLEVELAND, OHIO,

A CORPORATION OF OHIO.

T aZZ'w/wmt may concern.

Beit known that we, GEORGE F. NAAB and Funny PRELL, citizens of theUnited States, residing at Lakewood and East Cleveland, respectively, inthe county of Cuyahoga and State of Ohio, have invented certain new anduseful Improvements in Blowpipes, of

which the following is a specification.

This invention relates to blow pipes or pressure burners, such as areusedrfor producing a flame of high temperature forwelding, brazing orlike operations The object of the invention is to provide a simpleconstruction of this kind which enables a very high temperature to besecured at low cost for fuel; which is convenientto manipulate and iscapable of careful regulation as to the temperature and kind of flameproduced; and which device is of simple construction and is not likelyto get out of order in service.

A'further object of the invention is to pro.- videa blow pipe includinga pressure producing device to which the air and gaseous fuelaresupplied, said device being capable of notonly forcing the fuel andair mixture to the burner, but of also mixing the fuel and air topromote combustion, and which blow pipe also includes a burner suppliedby the pressure producing device and-in which the mixture of fuel andair is still further diluted by an additional air supply.

Further objects of the invention are inpart obvious-and in part willappear more in detail hereinafter.

In the drawings, Figure 1' represents a on a larger scale, of the blowercasing, the

blower and motor being omitted; Fig. 3 is a sectional elevation, on theline 33 Fig. 2,

and indicating the fan and a portion of the fan driving motor; and Fig.-4: is a central longitudinal section through the burner.

The blow pipe shown in the drawings comprises a suitable pressureproducing device 1 to which the air and gaseous fuel are supplied, andwhich'discharges the mixture to a connected tube or conduit 2 whichconducts it to the burner 3. These parts may be of any suitableconstruction for-the purpose.

The pressure producing device 1 comprises a hollow casing 4 having alateral hollow eX-' BLOW'PIPE.

Specification of Letters Patent. PatenfedSept 3Q, 1919 Application filedApril 27, 1917. Serial No; 164,953.

serted into an opening therein and clamped in position by a set screw 6,as shown.

Theo'pposite end of the casing is circular to form an inner "annular fanchamber 7 one side wall of WlllCll'iS provide'dwith a large Opening 8.The opposite wall of said. chamber extends outwardly in the form of ahollow circular boss 9 whose outer wall is provided with a number ofcircumferentially spaced'openings 11, and whose central'portion isthreaded to receive ascrew, 12 passing through a, rotatably adjustablevalvev member 13 in the form of a disk or plate having. a series ofopenings 14 to cooperate with the openingsll. Said plate 13 is: seatedin a circular recessor depression 15 r in the wall 10; and its centralportion is extended outwardly in the formof a caplfi inlwhiclrislocatedthe head of the screw 12..

municates with a passage .18 in a hollow boss or enlargement 19 of thecasing, and

which-:is threaded at its outer end to receive a pipe or'conduit 20communicating with a source ofgaseous fuel. Said boss orextension,-if;desired, may also be provided. with asmall side' port .21open to the atmosphere for preliminarily mixing with the fuel' be-' foreit. entersvthe fan chamber a small supply of air,1;although this is notessential.

The wall of the casing,;opposi te-the valve The member 13, forms asupport for the motor i and the pressure producing device operatedthereby'; As shown, 22-,ind1cates a portion of the motor frame, which isattached by bolts 23 to the wall of the casing around the-edges of thelarge-opening therein. 24:

indicates a portion of the motor, which may be of any suitable form, andis shown as an electric motor having avsh'aft 25' passing through-anopen-ing. 11113116 frame member 22.

On its inner endythe shaft 25' supports a suitable centrifugalzfanmember, shown asa When the motorsis started the fan sets suction in thechamber and draws in air through the ports 14, 11 and 21, and gas fromthe supply pipe 20. The 'air supply.

through'fthe ports 14, 11 may be more or less restricted by turningthevalve plate 13, while the gas supply through the pipe may alsoberestricted by more or less clos ing the valve 29, in said pipe. Thefuel is mixed with a preliminary air'suppl'y'at the i port 21, is mixedwith anadditional air supply in the mixing-chamber in the hollow bo ss9,and the mixture is made thoroughly homogeneous in the fan chamber.

The burner comprises a casing member suitably attached to the tube '2,either threaded thereon or merely sleeved over the same and'heldadjustable thereonby the set screw 31, as shown. Intermediate its endssaid casing member is enlarged toform a hollow is attached to thecentral portion of a spider member ti-mounted in the tube 2. Said'spider' member is provided with-several I fit therein, as shown.

I provided with a cross wall 36having a' central opening 37' thereinin'advance. of the large openings 35' betweenits radial :vanes to permitthe'free flow of mixture and may either} be threaded into the tubeoradriving Beyond the chamber 32 the casing 30 is baflleplate.v After themixture:-passes around the edge of the bafile plate it travels inwardlytowardthe: central axis and 7 through the opening 37.] Beyond the wall36the outer wall'of the casing diverges outwardly, as at 38, and isprovided with aseries of; circumferentially spaced. "ports or openings39,. whose axes converge toward thefront end of the burner. Theadvancing stream of mixture produces-a suction effect at theinner endsof the ports 39, so that adyditional air is 'drawnin through saidopenings and is supplied to and mixed with the mixture, which flowsthrough the forward nozzle end 40 of the burner and issues from Y theopening thereof, where it burns as a hot {The flow of flame p 1 mixturethrough the burner may be more or less advanced or retarded byslightadjustment of the casing 30 on the tube 2, toadjust the space betweenthe b-afile 33 andwall 36;

Suitable means may also be provided for supporting the blow pipe. Asshown, the casing 4 is provided at one point withasplit clamping eartltorreceive' a supportingrod The prod uct; is discharged into the tube2, through which it passes to the burner to be described.

clamped by turning up the clamping s crew,43. H

The blow pipe described is of simple construction and its variousadjustmentsperinit of exact regulation of thesizeand' temperature of theflame, due to the capability of moreor less restricting or promotingtheor post 42 to which the device may be i flown-f air or fuel, or both,and the possib-ility of regulating the proportions of air andfueltosecure perfect combustion. The

admission of both air and fuel to the chamf ber of the'pressureproducing device also se- 7 curesa very intimate mixture. and promotes.

combustion. What" is "claimed is r Lina-blow pipe, a tube,mean's forsupplying va mixture of: air and fuel to said tube, and a burner carriedby said tube and comprising a casing member, anozzle end therefor havingan opening therein of substantially uniform diameter, and a transr:

verse wall within the nozzle end .and-provided "w th a centrallydisposed mixture discharge opening of less diameter than the opening insaid nozzle end whereby. asuc-- tion is createdwithin said nozzle end. I

I 2.,111 a blow pipe,:a tube, means for sup- 1 in a mixture of air andfuel to said P Y e tube, and a burnercarried by saidtube and comprisingacasing member, .a nozzle end thereforhaving an opening; thereinrof.substant1ally uniform diameter, a transverse wallwithinthe nozzle endand provided with a cei'itrally' disposed mixture discharge opening-ofless diameter than the opening in said nozzle end whereby a'suctio'n iscreated within said nozzle end, and a baflle plate .within 'said casingmember ofj'larger ing fand adjacenttheretodiameter than the mixturedischarge open air and a fan chamber communicating therewith, a fan insald fan chamber, a burner singla hollow cas. ing having a' mixng-chamber for gas and member communicating with'said fanchame her andsupplied with mixture thereby, "a

conduit for supplyinggasto said mixing chamber, adjustable means foradmitting to said chamberquantities of air varyingfrom' zero toa'maximum, saidconduit being also provided with-"a portfori'prelimin'arily ad mitting a small supply-of air to the gas current-before it reaches the mixing chamber,

and means fori'admitting an additional air i supply to the burner memberbetween its outlet and the fan chamber,

"4. A blowpipe, including a burnertube,

a spider held within the 'endj'thereof and carrying a'circular'baffleplate spaced be yond the end of said tube, and aburner casingsurrounding the end of said tube and having an enlargementsurrounding'and ex.-

tending beyond said plate, saidcasingha ving across wall beyond saidplate and 'form-.

ing therewith a restricted passage through which the gas converges to anopening in said wall smaller than said plate.

5. A blow pipe, including a burner tube, a spider held Within the endthereof and carrying a circular baflie plate spaced beyond the end ofsaid tube, and a burner casing surrounding the end of said tube andhaving an enlargement surrounding and extending beyond said plate, saidcasing having a cross wall beyond said plate and forming therewith arestricted passage through which the gas converges to an opening in saidwall smaller than said plate, said casing being adjustable along saidtube V to more or less restrict said passage.

6. A blow pipe, including a burner tube, a spider held within the endthereof and carrying a circular baflle plate spaced beyond the end ofsaid tube, and a burner casing surrounding the end of said tube andhaving an enlargement surrounding and extending beyond said plate, saidcasing having a cross wall beyond said plate and forming therewith arestricted passage through which the gas converges to an opening in saidwall smaller than said plate, said casing having an extension beyondsaid cross wall provided with lateral air inlet openings.

7 A blow pipe, including a burner tube, a spider held Within the endthereof and carrying a circular baffle plate spaced beyond the end ofsaid tube, and a burner casing surrounding the end of said tube andhaving an enlargement surrounding and extending beyond said plate, saidcasing having a cross wall beyond said plate and forming therewith arestricted passage through which the gas converges to an opening in saidwall smaller than'said plate, said casing being adjustable on said tubeto more or less restrict said passage and having an extension beyondsaid cross wall provided with lateral air inlet openings.

In testimony whereof we afiix our signatures.

GEORGE F. NAAB. HENRY PRELL.

Copies of this patent may be obtained .for five cents each, byaddressing the Commissioner of Patents, Washington, D. 0.

